package com.mt.common.util;

import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.Timestamp;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;

public class ListSortUtil {
    private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(ListSortUtil.class);
    
    /**
     * 对List对象按照某个成员变量进行排序
     * 
     * @param list
     *            List对象
     * @param sortField
     *            排序的属性名称
     * @param sortMode
     *            排序方式：ASC，DESC 任选其一
     */
    public static <T> void sortList(List<T> list, final String sortField, final String sortMode) {
        Collections.sort(list, new Comparator<T>() {
            public int compare(T o1, T o2) {
                try {
                    Class clazz = o1.getClass();
                    Field field = clazz.getDeclaredField(sortField); // 获取成员变量
                    field.setAccessible(true); // 设置成可访问状态
                    String typeName = field.getType().getName().toLowerCase(); // 转换成小写

                    Object v1 = field.get(o1); // 获取field的值
                    Object v2 = field.get(o2); // 获取field的值

                    boolean ASC_order = (sortMode == null || "ASC".equalsIgnoreCase(sortMode));

                    // 判断字段数据类型，并比较大小
                    if (typeName.endsWith("string")) {
                        String value1 = v1.toString();
                        String value2 = v2.toString();
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("short")) {
                        Short value1 = Short.parseShort(v1.toString());
                        Short value2 = Short.parseShort(v2.toString());
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("byte")) {
                        Byte value1 = Byte.parseByte(v1.toString());
                        Byte value2 = Byte.parseByte(v2.toString());
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("char")) {
                        Integer value1 = (int) (v1.toString().charAt(0));
                        Integer value2 = (int) (v2.toString().charAt(0));
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("int") || typeName.endsWith("integer")) {
                        Integer value1 = Integer.parseInt(v1.toString());
                        Integer value2 = Integer.parseInt(v2.toString());
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("long")) {
                        Long value1 = Long.parseLong(v1.toString());
                        Long value2 = Long.parseLong(v2.toString());
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("float")) {
                        Float value1 = Float.parseFloat(v1.toString());
                        Float value2 = Float.parseFloat(v2.toString());
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("double")) {
                        Double value1 = Double.parseDouble(v1.toString());
                        Double value2 = Double.parseDouble(v2.toString());
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("boolean")) {
                        Boolean value1 = Boolean.parseBoolean(v1.toString());
                        Boolean value2 = Boolean.parseBoolean(v2.toString());
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("date")) {
                        Date value1 = (Date) (v1);
                        Date value2 = (Date) (v2);
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else if (typeName.endsWith("timestamp")) {
                        Timestamp value1 = (Timestamp) (v1);
                        Timestamp value2 = (Timestamp) (v2);
                        return ASC_order ? value1.compareTo(value2) : value2.compareTo(value1);
                    } else {
                        // 调用对象的compareTo()方法比较大小
                        Method method = field.getType().getDeclaredMethod("compareTo",
                            new Class[] { field.getType() });
                        method.setAccessible(true); // 设置可访问权限
                        int result = (Integer) method.invoke(v1, new Object[] { v2 });
                        return ASC_order ? result : result * (-1);
                    }
                } catch (Exception e) {
                    String err = e.getLocalizedMessage();
                    System.out.println(err);
                    LOGGER.error("Error",e);
                }

                return 0; // 未知类型，无法比较大小
            }
        });
    }
}
